A Solar Cell is a power source mentioned in The Arctic Incident that had a life span of less than a decade. They were used to power softnose lasers before the softnoses, due to the fact that they had been designed to kill rather than incapacitate, were made illegal and melted down. The softnoses used by the B'wa Kell during the B'wa Kell Rebellion were adapted to use human batteries because solar cells have become extremely rare, and are apparently worth their weight in gold, and are most likely no longer produced. Most of those remaining are used by antique dealings to power old gadgets.